                          Frequencies and levels

All frequencies must be a multiple of a same step. In this screen, enter
the integer and positive multiplying factor. To improve the graphics accuracy,
it is better that one carrier have a null frequency.

Levels must be specified in decibels, relative to the 0 dB level.
Generally, a level value is negative. Especially if you specify output
levels, the global level must be less than zero (positive backoff).

Carriers can be specified individually or in groups:

- individually: enter 1 in the third column

- by groups of carriers of equal amplitude and equal frequency spacing.
    - first column: frequency of the first carrier in the group (carrier with
      the lowest frequency),
    - second column: level of one carrier,
    - third column: number of carriers in the group
    - fourth column: frequency spacing, in number of elementary steps.


Groups can overlap, but all frequencies must be different.
After edition, you will be proposed to save this list in a file with a .MCR
extension.

Note 1: you MUST give the name of an existing .MCR file in the menu. When
   saving a different set of groups, frequencies and level, you will be
   proposed the name of the existing file: refuse, and give another name.

Note 2: during a session, there is only room for one comment in memory
   (a #2 Kb array), so you will be proposed the canal comment: do not hesitate
   to erase it.
In the .MCR file comment, write the location of levels: amplifier input or
output.









Function of keys:
F1           : displays this screen.
Tab          : moves the entry field right. If the entry shift is the
               rightmost one, returns to the first (leftmost) entry shift.
High Low     : moves the entry field vertically, one line.
Pgup Pgdn    : moves the entry field vertically,  16 lines.
Ins          : insert a new line (group) below the cursor line.
Ctrl y       : erase the cursor line (group).
Enter or Esc : end of edition.

